Respiration is a series of reactions in which energy is released from glucose glucose: A simple sugar made by the body from food, which is used by cells to make energy in respiration. Aerobic respiration is the form of respiration which uses oxygen. It can be summarised by this equation:
perturbation in Science. A small change in a physical system, most often in a physical system at equilibrium that is disturbed from the outside. Variation in a designated orbit, as of a planet, that results from the influence of one or more external bodies.
When you're perturbed, you're upset by something, and rattled enough by it to be thrown off your usual calmness into a state of confusion. In astronomy, perturbation is defined as the effects on a large body when it is subjected to gravitational effects from more than one other large body..